代码修改后的版本，全部提交

COSXML/Model/Bucket/PutBucketDomainRequest.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Text;
+
+using COSXML.Common;
+using COSXML.Model.Tag;
+using COSXML.Network;
+
+namespace COSXML.Model.Bucket
+{
+    /// <summary>
+    /// 检索 Bucket 是否存在
+    /// <see cref="https://cloud.tencent.com/document/product/436/7735"/>
+    /// </summary>
+    public sealed class PutBucketDomainRequest : BucketRequest
+    {
+        private DomainConfiguration domain;
+
+        public PutBucketDomainRequest(string bucket, DomainConfiguration domain)
+            : base(bucket)
+        {
+            this.method = CosRequestMethod.PUT;
+            this.domain = domain;
+            this.queryParameters.Add("domain", null);
+        }
+
+        public override Network.RequestBody GetRequestBody()
+        {
+            string content = Transfer.XmlBuilder.BuildDomain(this.domain);
+            byte[] data = Encoding.UTF8.GetBytes(content);
+            ByteRequestBody body = new ByteRequestBody(data);
+            return body;
+        }
+    }
+}